Rotor member for superconducting generator

Abstract

A rotor is provided for an alternating current generator carrying a superconducting field winding and having a combined damper and shield member on the rotor. The damper-shield member is a composite cylindrical member extending over the field winding and consisting of concentric inner and outer cylinders of a high-strength, non-magnetic alloy and an intermediate cylinder of aluminum or other material of high electrical conductivity.

What is claimed is: 
     
       1. A rotor member for a dynamoelectric machine, said rotor member including a cylindrical rotor body carrying a field winding of superconducting material, means for circulating a cryogenic coolant fluid through said field winding, and a damper-shield member attached to the rotor member for rotation therewith, said damper-shield member being a cylindrical member surrounding the rotor body concentrically therewith and radially spaced therefrom and being a composite member consisting of three concentric cylinders disposed coaxially with their adjacent surfaces engaging each other and being rigidly secured together throughout their length, the radially inner and outer cylinders being made of a high-strength, non-magnetic material and the intermediate cylinder being made of a material of high electrical conductivity. 
     
     
       2. A rotor member as defined in claim 1 including means for circulating a coolant through said damper-shield member to remove heat therefrom. 
     
     
       3. A rotor member as defined in claim 2 in which said means for circulating said coolant through said damper-shield member includes ducts for providing the flow of said coolant extending longitudinally between the outer cylinder and the intermediate cylinder. 
     
     
       4. The composite member as defined in claim 1 in which said intermediate cylinder is made of copper. 
     
     
       5. The composite member as defined in claim 1 in which said intermediate cylinder is made of a copper alloy. 
     
     
       6. The composite member as defined in claim 1 in which said intermediate cylinder is made of aluminum. 
     
     
       7. The composite member as defined in claim 1 in which said intermediate cylinder is made of an aluminum alloy. 
     
     
       8. The composite member as defined in claim 1 in which said inner and outer cylinder is made of a non-magnetic nickel alloy. 
     
     
       9. The composite member as defined in claim 1 in which said inner and outer cylinder is made of a non-magnetic steel.